Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975iowa.rept.....t&link_type=abstract
Progress Report Iowa Univ., Iowa City. Dept. of Physics and Astronomy.
Astronomy and Astrophysics
Astronomy
Cosmic Rays, Interplanetary Space, Pioneer 10 Space Probe, Pioneer 11 Space Probe
Scientific paper
The intensity of galactic cosmic radiation in interplanetary space has been observed over the heliocentric radial range 0.99 less than r less than 5.26 a.u. with five Geiger-Mueller tubes on the Jupiter-bound spacecraft Pioneer 10 and over the range 1.00 less than r less than 3.59 a.u. with three similar tubes on Pioneer 11, also bound for Jupiter. The observations span the time period 3 March 1972 to 29 April 1974, near the epoch of minimum solar activity. The contributions of solar energetic particles are eliminated.
Thomsen Michelle F.
Van Allen James A.
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